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Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Other intangible assets |  |  |  |  |
Gross carrying amount | $ 258,162 | $ 119,501 | $ 258,162 | $ 119,501 | $ 119,501
Accumulated amortization | (86,525) | (66,418) | (86,525) | (66,418) | (69,685)
Net carrying amount | 171,637 | 53,083 | 171,637 | 53,083 | 49,816
Amortization expense | 9,560 | 3,268 | 17,232 | 9,817 |
Estimated amortization expense for other intangibles for each of the next five quarters |  |  |  |  |
December 31, 2020 | 9,437 |  | 9,437 |  |
March 31, 2021 | 8,831 |  | 8,831 |  |
June 30, 2021 | 8,613 |  | 8,613 |  |
September 30, 2021 | 8,201 |  | 8,201 |  |
December 31, 2021 | 8,200 |  | 8,200 |  |
Thereafter | 128,355 |  | 128,355 |  |
Net carrying amount | $ 171,637 | $ 53,083 | $ 171,637 | $ 53,083 | $ 49,816
Minimum |  |  |  |  |
Other intangible assets |  |  |  |  |
Estimated useful lives |  |  | 2 years |  |
Maximum |  |  |  |  |
Other intangible assets |  |  |  |  |
Estimated useful lives |  |  | 15 years |  |

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